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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6bdd502b8256355f8e850810fb42b8acd514d2a2f2bc80448c405ba5c6fe40' 
  AND token = '3gZxajVZTaAKw38wEntd5KxUdIOMz3KuMZ7Wq2Thvls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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