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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9520d5fccf9611113a93b3558b04c639a27c6dc32a9d7c0aef2f4fdeea42c2f4' 
  AND token = '5w28vbbe0IgVyOmO7ViJspesQymyM+7JEofN5lyfOMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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