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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab040013e639be2efc1c26ba89d98861e481d432cb8e6fe006ee58b2dd8b687' 
  AND token = 'bj7MI/A/gkaVEuFTdmi8BiKUPlwn84/woaebQhhdVOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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