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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211dfe41d119bf919165a5e537b6ab8a658ea3e904cc176335fcb6428c608e37' 
  AND token = '0J4yt/WP/v6d+s5c3D6mBGe+SQjM6i8nFyhIXXIQFv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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