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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e0418096dabd787b62e1fab45bde3f26ee2a4fd8ff521b98d490c93240b308' 
  AND token = 'J60CHFGSLSdBX/FfnQ7aGJ7lJpbKVowxe6G2WS9NRts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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