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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015942d7d805b651d658cfa29309c312affef5a3d164205e806e31c1e8692433' 
  AND token = 'z+bJtVb2cWABUCvh5scCRPqT2yQegNNPpWDc32ZceNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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