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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013d32b446e1b06306bd64e59fe6a79a9319e759606a81fd2fd76e3c761a7617' 
  AND token = 'iNTy63WZJQLu4vo1zuz9oEh5AN5WDuTOk69Xcw/5V0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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