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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49aa7e7c328e0a29283e1953af5e71cd9afa5af64c0a1475e76d5349c6786cc' 
  AND token = 'o082tOF6NlAd/eg/XffOGUf6XfFtbmhX8VxNF8q6FOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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