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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fbaa8267f8cdfed0f3493dcd729d0770b805b91833695145f316794e84b655' 
  AND token = 'Jp+1GJaKa5eg3hEbJEQ5bAUTkl8y46KTNNqBDUZ44wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}