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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3bbd9d152de076a84df72d3dbbf5fe9fa3d02fccda8d8061af267e32c4d331' 
  AND token = 'Zi0CYs5s6EfmM/LTW9JYaN85TyAB2XptfZSu2SylOfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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