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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9da2da001edc331238e0ab5916a5f765d139de57a2368409c1fa255709606bf' 
  AND token = 'RXzwtEaQ0U8hsvnOWZDw/8GhILJ50IGJiyc53xAKMxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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