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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca58957f949d39a9448a96de517c9beb525f74f93a0046a3de34ba20d0c9be1' 
  AND token = 'SlSl+/PV0nNw98WFdGwXY9JgYQR3ItT9sCJ1Ea8i7CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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