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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cd40caf21935646c0674652aee14c89613a5c9d5019e41ab008d85336d22e3' 
  AND token = 'KWN/F/BlrezGlbaLK+pVI8/mlp2XNx/ub98TRW3gELI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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