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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7db95c4cae689d96c4f44b71fe79d1f3b81ebf8ca10718b769be9fd37f45122' 
  AND token = 'cjXKiZTkbgZPbI2uUngZvz1r7+W5CrLamHCe1aAcnDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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