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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0707df332a78776b6a2e3e40abe156a49e45c769b23a9016b8fe3dbd35547448' 
  AND token = 'SmMlCUczLHZ6PWDgfE5Y0yNWy2JIT+u8IG9TyzTvE+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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