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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01c8ab95d48952f96b485787a3a87fce418e95494c96b7cd076f1a5215fbc39' 
  AND token = 'AGAchFb3zQWfxTDCSfdrYr7HZ3PHGPWScZv3Q9kLTjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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