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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046c43c3ae13f7bd12b8734524e1d025a5ff72f8266a6f0c1bbf208596134a4c' 
  AND token = 'ZH0yDvbsw3eFYP+5itFETA6KNcG6cO72YhsNBUclh0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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