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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a0cb6810adf4215f9ce1828deddd70ed85307ad49b70a61f44163a10468d38' 
  AND token = 'r/cCh6Xcz1tg/cdoo35jme6I2AJX1TCc8wZyl0A6F9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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