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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61b2a4c54cb9187cc8abf8e1ebcfd79963ed6192a4191c5f8a754126382b4a5' 
  AND token = '2hrQFq9oxzn11Mlb+n0ZnW/atMeK8P0Sz+RkjEtCin4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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