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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2dfcc8d85f2172a2af9fcb1e87bba4be13dae88ec2e9f2fa791558b495d60e' 
  AND token = '8AHtBokzeIg2Ibhdr4mAFexrgCzSR36uTEc5PWSIvxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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