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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99eafe7557a2d7f7dd40f46e07b75f5f05d418bcd3bb863df4aa8fd41ceec3f' 
  AND token = 'zoSlJAqRb23WbE15+1Np4pQN2WBOlM5sR62DYpnrIvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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