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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da98f47f113d86808e1fb9a2eb34cd56387430c8ba7008a56dd2cf511298ae3f' 
  AND token = 'SYQFgnsoI88mAJ3reN7Bu/Wm3YFvsSSPYa0o0WK55Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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