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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40880c25d721f70ddc2ab986293123dca069303eb274a5b513242f9b75f97ef8' 
  AND token = '6e84CtbWK6wgah0FgWN5Dora2JfFyrEBPoG15EQOLw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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