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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62158c2c93fa7991c6779ed36ca9298e7cadff862af2831d083cf0b9a6cefe2' 
  AND token = '5mqT7VeXX8uUqB/fn1DBT3Sdm+lF5sNomNv04hTGivI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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