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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9f5b26f309693f34e911beed7602d8618e4ec472f404bc95b5e7ad7cb790dd' 
  AND token = 'DdgL3gxGVuYdTb4iS0eSFuaA6cgAU+ZIU/SNllhiV9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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