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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecb08de3480f0e133605c7401d07c74244b41ce40f3ac7c49d2eedd0c09e37e' 
  AND token = 'aioVUy4dtmIII4d7U/jNd3NxBsHrYe1XUAFZGhh7N+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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