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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed34d7e369f5dab2976c58c0f92106090618dab4b8438ff83261da205851a81' 
  AND token = 'g7WlOcnZsMr7oQOcB/dJMXppMb7X7jRbj7G8Adbr3Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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