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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8d1157be3917f1e0206dd7851c0c4945332757773f517bbd012e59232c9f6d' 
  AND token = '1x0yota5zCVIi4dQqYuB3eYIdHRas37wLkXTQN3uasQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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