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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1584b76538be94a0d8e8a5d9d6fc087714566eea4b19ce3dae7e1d3ff96655' 
  AND token = 'FBF++NAiL9NBBTupEwJxBKO2o1eirRsAkuzQA/ksyYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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