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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae065a2593c875f2240bce3cabea77da318879df07e700cb1b3ae37834c2e54' 
  AND token = '/LnGDkF+l/IzBZISsZo5UzSSvNRw0WFpr8TnEl1am5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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