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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79c766742b1471cd103271830cbe8d5e9eab1005aa9114d285229100c151775' 
  AND token = 'h7lAc5P9odDvbr6Y7ssFyPpBqutBq31etxTcvk+aqa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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