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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c567485c191418c1cdedd5e124ace6ce60149c60098627e45aec1e12a3224d' 
  AND token = '4/L/s+h+4nFiCx9stdES+PF/+eQuW+E4DM9G+qkn9cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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