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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404e0aaadc5aeae41d1a94f6436c3769bec6cb94d941ec748dabc5a2f5fbe6ed' 
  AND token = '7ajbxGc5Y2QMWgDqYOfIW0UHoUJr2PycTKcH2x2DFRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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