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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51f4dbe5fa55a31d84f566ef237c739f957cae61f44e6eb90c7879e57e22584' 
  AND token = 'RqKQ0YsODs1c184KUId1K/v0aP/rqyg9LLDuCowdeKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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