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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72aab9fde7d9a87fe8559696902a90fe17ae6d64c4c2804566232426c8eeb895' 
  AND token = 'mMdfvp5c59XYwwJ7Ed4102dr4tbqEP4VfCH6qILdZmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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