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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d411ff5d3f9a2c08d7509b6dd5ca56cf8787f41ec8b283f17ac1383cc3c2ee' 
  AND token = 'Cj+5eMcCQaSsZT6PFZ5S5//G/wUmdYv7Z3ZPe9jMn7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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