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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd006dd93cf0e62757a73aa5526c277698ec14fb22d29e693d3c4d1b5eda14d' 
  AND token = 'u4Gs8L1puXrXn6ua3NzI0aY91dkr5O/w/UlNeuh85xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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