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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679e5a15ff702923e275553ba908e0a70cba5c4bb4fca4015036aa93c738e6ea' 
  AND token = 'w4X2Rn7EJWP1w3k2TI9QBNides2NaG7acnN+KeB66/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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