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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5917e337216426994f409fdb1b6e1bece2f9f8ec45545cf46b0e28b491a529' 
  AND token = 'LPi57yJ0j5Ods20Bkw5Qthglesq44yckEIsgBlyFJ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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