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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f96d043134e059b9cb4349fc7b8db18c524fb56e5680b5c045c9fcdc5632c00' 
  AND token = 'EVkWowPXIdhixlU/qrfpdrS0sgKZXTB7x48eXtBdC6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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