SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd69db5e34651f81a73f011b3e4a03d82fa427e1ae33288b5074b6ee31c2656b' 
  AND token = 'aShzDnxfBnegZ5vn8DsDR9mofKwv6KDSVWFYThnmROw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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