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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a637f008ca5901ec4e48f04682440bcd1c7578f808e47687a9c0af153544fb' 
  AND token = 'ELdXFrlVD3MbKcAN5WCUbef/e9NVc6MjGJCPCO8C81o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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