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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836304f292d9f45505650aa15befaf0370098d6aa2ed3291d2d5744b7049cf46' 
  AND token = '1aQnnept8YjioCSNJbQOgNGIQuFvm+eXwwlPNEWAbW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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