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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa69a113d6af41a3ea6841cfd71a19c284562fa4beca96057ad8de831bb9393' 
  AND token = 'Q6pePUJyilCqp1hlDQ78RBv+aWzFIfjMaqFWZ3eikbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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