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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f04311c6d936bb5092d8eb7edbdc55f5a99e1c7ed124ab19c8e9e3fae57c8a' 
  AND token = '8QA+dwrtxno3pBdelc1eFs/4ccqYNpr7HvICasLib5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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