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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d683dda61e0d823b431003113219431e8f8b97dd775f6bfc75d8bfb96f3c7a' 
  AND token = '2Kc/ywgKbtbqlr5PYw8c3AOClCMlXG4MwzRGkmOY/5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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