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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd83b089b2e44a5ac89089b7328ed6770f08dbd0e35f0f77e5ff9a8ba7b9fcc' 
  AND token = 'DlW5YaPLtN0TKGNBvdNjD8hZRmAY/mvQHECkfhNJvPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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