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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a4e7f961fe984490e9afca03c507ad4145c733c6f5a8aa3d5ec60e28dafbaa' 
  AND token = 'f2+iIyalr1/Oo+zPZXqNz5oJDpeBwjbvkjLQOnZr2+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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