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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e3281341a18861e379104f9d1459e5caad3398d2ad188d75075a9672712d29' 
  AND token = 'mf2tQB440bHbTKJyYYFNRnhMkXloZ9HH+jlQpU1d+P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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