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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e91e4c7871d4992983122da8d0f4f6002c7aa2d3eaa3348ea54843b3eafb38' 
  AND token = 'C4CMiEVPvgH2QVo6zQ0TDluLAN7rPtk7ebfKC/d+JFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00136

JSON explain

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