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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d2a791223118f18fcdc8e990805f8ae955c96d42a1886dd4c8c40e74a50e07' 
  AND token = 'tJFKELP5oGt/+ufhJ664gkV2eJVCDfDTQ6Av1NAlp9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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