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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579acf48c01da901ac41b4993737295e642a9147fe83c128213a517e803e19d1' 
  AND token = '0A0WQ7veQMc4HC5j3CgyrTpJLWLaZdKbIE0OdAIeoOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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