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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3504a6825b986293ce778917636aade75c877ef8a02e3fee5d066990158fef3' 
  AND token = 'sM88qW65GiMjldVAb1ENET8GD5BM4JeMODuMoaj4PKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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