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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b12c6e904f32d0677c639b9a2b3d7577393ff00537fdfa3300108d42437865c' 
  AND token = 'o3lgvix27i2ZhJj17mKUMtW+cRsXsNq8L/yd52Zu06Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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