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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed39eeaa55e4cd6206e3c991ba935ab9bd47dd06b06e68b39dfdd174c34b3f5' 
  AND token = 'TZYf9uFl1CEGwINVb7sJIHk/bwGValrrjFofOdVqrO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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