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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c86f5a63f5d82ae5303282d6b236b69d95f9ef7a588fd909ec8044d88cbaf8' 
  AND token = '3X65Wu25owYDYDhl9lFUiklKQtCbEUg3i3DKOqCcg+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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