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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f3d4de2efc30a91c9dda0f1045833a155e9889ae9e479e05496937df7540ff' 
  AND token = 'TPoiMDn3FSu2EIIenluSflWkFP63ShipYoFwc0ysoy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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