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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91b97a7e4dbad0a79de071310804f076d8ca46a0635c0c8d39dc1d000faebd7' 
  AND token = 'm0w7WVPcub1GaKaZUWr4kugqZgrn676xltUU/yGUKdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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