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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a36a2786a83cb2e0442290f0ac3547ed015f7329bf860abace6dc1352ad654' 
  AND token = '3hZyzZwZ1guKuodWaCSdxxCP3hUEFQZ2QoCCxo6yYtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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