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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ccfe899aad61f45f02517df871d4828b3d2986480c70ffec479b861c227d7b' 
  AND token = '3rOVOw0lHxoq6O54vyU2NoDHPrLObXtpPSPqtbbJ38M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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