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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311c849f961d4b17b07915c859c8ec0a4edcd0a1391dbc5ca7880f334e141e65' 
  AND token = 'ehH8rHhOsNfs8fP490IuW8ryiOP2Ro24NEj6ifuV9yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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