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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cc489ffb6c3d3b3a7322d188da3f9a3b9db72b619e09546903a670a71482ff' 
  AND token = '1GXiSKMR7WP8/joW0pdZWEW80Ux3ieUntFhqDh7nuWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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