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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d06e45eac4b9f50e72e1a2755ab264535989a12eb29dbe823c16abe9c044fc' 
  AND token = 'MpACbYb9/BwF5HqX7GUm9Zr3SL+OLOf/UL0GYoRnfB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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